package org.apache.ddlutils.platform.mckoi;

        /*
         * Licensed to the Apache Software Foundation (ASF) under one
         * or more contributor license agreements.  See the NOTICE file
         * distributed with this work for additional information
         * regarding copyright ownership.  The ASF licenses this file
         * to you under the Apache License, Version 2.0 (the
         * "License"); you may not use this file except in compliance
         * with the License.  You may obtain a copy of the License at
         *
         *   http://www.apache.org/licenses/LICENSE-2.0
         *
         * Unless required by applicable law or agreed to in writing,
         * software distributed under the License is distributed on an
         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
         * KIND, either express or implied.  See the License for the
         * specific language governing permissions and limitations
         * under the License.
         */

import org.apache.ddlutils.Platform;
import org.apache.ddlutils.model.Column;
import org.apache.ddlutils.model.Database;
import org.apache.ddlutils.model.Table;
import org.apache.ddlutils.platform.SqlBuilder;

import java.io.IOException;
import java.util.Map;

/**
 * The SQL Builder for the Mckoi database.
 *
 * @version $Revision$
 */
public class MckoiBuilder extends SqlBuilder {
    /**
     * Creates a new builder instance.
     *
     * @param platform The plaftform this builder belongs to
     */
    public MckoiBuilder(Platform platform) {
        super(platform);
        // we need to handle the backslash first otherwise the other
        // already escaped sequence would be affected
        addEscapedCharSequence("\\", "\\\\");
        addEscapedCharSequence("'", "\\'");
    }

    /**
     * {@inheritDoc}
     */
    public void createTable(Database database, Table table, Map parameters) throws IOException {
        // we use sequences instead of the UNIQUEKEY function because this way
        // we can read their values back
        Column[] columns = table.getAutoIncrementColumns();

        for (int idx = 0; idx < columns.length; idx++) {
            createAutoIncrementSequence(table, columns[idx]);
        }

        super.createTable(database, table, parameters);
    }

    /**
     * {@inheritDoc}
     */
    public void dropTable(Table table) throws IOException {
        print("DROP TABLE IF EXISTS ");
        printIdentifier(getTableName(table));
        printEndOfStatement();

        Column[] columns = table.getAutoIncrementColumns();

        for (int idx = 0; idx < columns.length; idx++) {
            dropAutoIncrementSequence(table, columns[idx]);
        }
    }

    /**
     * Creates the sequence necessary for the auto-increment of the given column.
     *
     * @param table  The table
     * @param column The column
     */
    protected void createAutoIncrementSequence(Table table,
                                               Column column) throws IOException {
        print("CREATE SEQUENCE ");
        printIdentifier(getConstraintName("seq",
                table,
                column.getName(),
                null));
        printEndOfStatement();
    }

    /**
     * Drops the sequence used for the auto-increment of the given column.
     *
     * @param table  The table
     * @param column The column
     */
    protected void dropAutoIncrementSequence(Table table,
                                             Column column) throws IOException {
        print("DROP SEQUENCE ");
        printIdentifier(getConstraintName("seq",
                table,
                column.getName(),
                null));
        printEndOfStatement();
    }

    /**
     * {@inheritDoc}
     */
    protected void writeColumnDefaultValue(Table table, Column column) throws IOException {
        if (column.isAutoIncrement()) {
            // we start at value 1 to avoid issues with jdbc
            print("NEXTVAL('");
            print(getConstraintName("seq", table, column.getName(), null));
            print("')");
        } else {
            super.writeColumnDefaultValue(table, column);
        }
    }

    /**
     * {@inheritDoc}
     */
    public String getSelectLastIdentityValues(Table table) {
        Column[] columns = table.getAutoIncrementColumns();

        if (columns.length > 0) {
            StringBuffer result = new StringBuffer();

            result.append("SELECT ");
            for (int idx = 0; idx < columns.length; idx++) {
                if (idx > 0) {
                    result.append(",");
                }
                result.append("CURRVAL('");
                result.append(getConstraintName("seq", table, columns[idx].getName(), null));
                result.append("')");
            }
            return result.toString();
        } else {
            return null;
        }
    }

    /**
     * Writes the SQL to recreate a table.
     *
     * @param model      The database model
     * @param table      The table to recreate
     * @param parameters The table creation parameters
     */
    protected void writeRecreateTableStmt(Database model, Table table, Map parameters) throws IOException {
        print("ALTER ");
        super.createTable(model, table, parameters);
    }
}
